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Rules for Naming Binary Ionic Compounds Containing a Metal Ion With a Variable Charge. A binary ionic compound is composed of ions of two different elements - one of which is a metal, and the other a nonmetal. For example, iron(III) iodide, FeI3, is composed of iron ions, Fe3+ (elemental iron is a metal), and iodide ions, I- (elemental iodine is a nonmetal). Rule 1.
The ion with the smallest number of oxygen atoms has the prefix [hypo- and the suffix -ite. When naming ionic compounds, the postive ion name is given first followed by the name of the negative ion. Example: NaBr: sodium bromide. Binary compounds form the combination of two nonmetals and is composed of molecules.